Percentages of ONS birth records linked to HES delivery records by match rank, England, 2005–2014
| Year of birth | Match rank | ||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Total | |
| 2005 | 66.0 | 2.6 | 1.0 | 0.1 | 0.9 | 28.8 | 0.6 | 0.1 | 100.0 |
| 2006 | 69.4 | 2.6 | 1.0 | 0.1 | 1.2 | 25.1 | 0.5 | 0.1 | 100.0 |
| 2007 | 73.5 | 2.9 | 1.2 | 0.1 | 0.5 | 21.3 | 0.4 | 0.0 | 100.0 |
| 2008 | 77.3 | 2.9 | 1.3 | 0.1 | 0.4 | 17.6 | 0.4 | 0.0 | 100.0 |
| 2009 | 81.7 | 2.8 | 1.4 | 0.1 | 0.3 | 13.4 | 0.3 | 0.0 | 100.0 |
| 2010 | 85.5 | 2.5 | 1.5 | 0.1 | 0.3 | 10.0 | 0.2 | 0.0 | 100.0 |
| 2011 | 88.2 | 2.5 | 1.5 | 0.1 | 0.3 | 7.2 | 0.2 | 0.0 | 100.0 |
| 2012 | 90.5 | 2.5 | 1.6 | 0.1 | 0.3 | 4.9 | 0.1 | 0.0 | 100.0 |
| 2013 | 92.0 | 2.5 | 1.7 | 0.1 | 0.2 | 3.5 | 0.1 | 0.0 | 100.0 |
| 2014 | 92.7 | 2.7 | 1.8 | 0.1 | 0.3 | 2.5 | 0.1 | 0.0 | 100.0 |
HES, Hospital Episode Statistics; ONS, Office for National Statistics.